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Both Gov. Mark Dayton and Sen. Al Franken are leading their Republican challengers, Jeff Johnson and Mike McFadden, in a new SurveyUSA poll released this week.

The poll of 600 likely voters was commissioned by KSTP-TV and taken Aug. 8-21.

In the governor's race, DFLer Dayton led Johnson, a Hennepin County Commissioner, 49 percent to 40 percent. Hannah Nicollet, the Independence Party's candidate, had support from 3 percent of respondents, while 5 percent were undecided.

Franken is sitting on an even wider lead over McFadden, a first-time candidate. Franken, first elected by an extremely thin margin in 2008, is backed by 51 percent of respondents compared to 42 percent for McFadden. The Independence Party's Steve Carlson was backed by 2 percent while 3 percent were undecided.

The margin of sampling error in both cases was plus or minus 4.1 percent.

Franken's approval rating in the poll was 56 percent positive, while 35 percent disapproved of his performance. But the news wasn't all good for Democrats: the poll found that 52 percent disapprove of President Obama's performance, while just 38 percent approve. The margin of sampling error in those cases was plus or minus 3.7 percent.

PATRICK CONDON